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Retirement Plans and Other Retiree Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Other Retiree Benefits        
Components of net periodic benefit cost        
Service cost $ 3 $ 3 $ 11 $ 11
Interest cost 9 9 28 30
ESOP offset 0 (1) 0 (1)
Expected return on plan assets (1) 0 (1) 0
Amortization of transition and prior service costs (credits) 0 0 0 0
Amortization of actuarial loss (gain) 2 1 11 9
Net periodic benefit cost 13 12 49 49
United States | Pension Benefits        
Components of net periodic benefit cost        
Service cost 0 0 1 1
Interest cost 21 23 64 70
ESOP offset 0 0 0 0
Expected return on plan assets (28) (28) (86) (83)
Amortization of transition and prior service costs (credits) 0 0 0 0
Amortization of actuarial loss (gain) 12 12 35 36
Net periodic benefit cost 5 7 14 24
Voluntary benefit plan contribution     67 81
International | Pension Benefits        
Components of net periodic benefit cost        
Service cost 3 4 10 11
Interest cost 5 6 16 16
ESOP offset 0 0 0 0
Expected return on plan assets (5) (5) (16) (15)
Amortization of transition and prior service costs (credits) 0 0 0 0
Amortization of actuarial loss (gain) 2 2 6 7
Net periodic benefit cost $ 5 $ 7 $ 16 $ 19